Unit 2 Lesson 3

Which is a chemical change?

• freezing

• melting

• mixing

• rotting

A loaf of bread is left on the counter and begins to get moldy. Which if these is evidence a chemical change has occurred?

• the bread is softer

• the bread changed color

• the is warmer to the touch

• no change has occurred

Cutting a piece of paper is an example of

• physical change

• chemical change

• solubility

• no scientific change

A change in phase, for example a liquid changing to a solid, is an example of a _______________________ change.

• physical

• chemical

• soluble

• no scientific

True or false: The amount of matter remains the same, no matter the type of change it undergoes.

• True

• False

Which of the following is an example of a chemical change?

• building a structure with blocks

• breaking glass

• making a smoothie

• baking a cake

Blake chops down a tree. He then cuts it into pieces and burns a fire. The tree is reduced to ashes. What happened to the amount of matter?

• The amount of matter increased

• The amount of matter decreased.

• The amount of matter remained the same after cutting, then decreased after it was burned.

• There was no change in the amount of matter.

Which of these describes a physical change?

• odor from rotting trash

• folding paper

• steaming vegetables

• frying an egg

A change in phase from a liquid to a gas is a ___________________ change and requires the input of_________________.

• physical; energy

• physical; matter

• chemical; energy

• chemical; matter